Preparation and properties of the VC/Cr3C2/TaC doped ultrafine WC-Co tool material by spark plasma sintering
Preparation and properties of the VC/Cr3C2/TaC doped ultrafine WC-Co tool material by spark plasma sintering
复制标题
放电等离子烧结VC/Cr3C2/TaC掺杂超细WC-Co刀具材料的制备及性能
DOI：
10.1016/j.jallcom.2019.152598
复制
发表时间：
2020-03-05
影响因子：
6.2
通讯作者：
Jia, Jiheng
中科院分区：
文献类型：
--
作者：
Wang, Boxiang;Wang, Zhenhua;Jia, Jiheng
本文主要研究超细WC-Co硬质合金的制备及其性能。采用放电等离子烧结技术，以纳米WC和Co粉末为原料，添加不同的抑制剂VC、Cr 3C 2和TaC，制备了不同的试样。采用VC/Cr 3C 2/TaC（0、0.4和0.8wt%）单独添加和VC-Cr 3C 2、VC-TaC和Cr 3C 2-TaC成对添加的方法，研究了抑制剂对硬质合金显微组织和力学性能的影响。结果表明，随着VC/Cr 3C 2/TaC的加入，WC的平均晶粒尺寸减小，VC的晶粒尺寸小于Cr 3C 2和TaC。添加VC的硬质合金中WC的晶粒形貌为多台阶的三棱柱结构，而添加Cr 3C 2/TaC的硬质合金中WC的晶粒形貌趋于圆钝。此外，缓蚀剂的加入还不同程度地提高了硬度，降低了断裂韧性。横向断裂强度（TRS）的影响，晶粒尺寸和WC/Co界面能的抑制剂引起的变化。在1250 ℃烧结的0.4wt%VC-0.4wt%Cr3C2试样具有综合力学性能。其相对密度、平均晶粒尺寸、硬度、断裂韧性和TRS分别为98.9%、200 nm、2110 kg/mm（2）、10.4 MPa·m（1/2）和1990 MPa。(C)2019爱思唯尔B. V.保留所有权利。
This work is focused on the preparation and properties of ultrafine WC-Co cemented carbides. Samples were prepared by spark plasma sintering technology using WC and Co nanopowders and different inhibitors such as VC, Cr3C2 and TaC. The influence of inhibitors on the microstructure and mechanical properties of cemented carbides was investigated by using separate addition of VC/Cr3C2/TaC (0, 0.4 and 0.8 wt%) and pairwise addition (VC-Cr3C2, VC-TaC and Cr3C2-TaC). The results showed that with the addition of VC/Cr3C2/TaC, the average WC grain size decreased and VC led to smaller grain size than Cr3C2 and TaC. WC grain morphologies of cemented carbides with VC were triangular prisms with multi-step structure, whereas tended to be round and blunt in cemented carbides with Cr3C2/TaC. Moreover, the addition of inhibitors caused hardness to increase and fracture toughness to decrease in various degrees. Transverse rupture strength (TRS) was affected by changes in grain size and WC/Co interfacial energy caused by inhibitors. The sample with 0.4 wt% VC-0.4 wt% Cr3C2 sintered at 1250 degrees C had comprehensive mechanical properties. Its relative density, average grain size, hardness, fracture toughness and TRS were 98.9%, 200 nm, 2110 kg/mm(2), 10.4 MPa.m(1/2) and 1990 MPa, respectively. (C) 2019 Elsevier B.V. All rights reserved.